Organic light-emitting devices and light source systems

An organic light-emitting device comprising:

• a first electrode;
• a second electrode;
• organic multi-layers formed between the first electrode and the second electrode;
• the organic multi-layers having a hole blocking layer, a first emission layer, a second emission layer, and an electron blocking layer;
• and
• the first emission layer and the second emission layer being stacked and interposed between the hole blocking layer and the electron blocking layer;
• wherein a first light-emitting dopant is added to the hole blocking layer,
• a second light-emitting dopant is added to the first emission layer,
• a third light-emitting dopant is added to the electron blocking layer,
• a fourth light-emitting dopant is added to the second emission layer,
• the first light-emitting dopant traps electrons that inject to the first emission layer, and
• the third light-emitting dopant traps holes that inject to the second emission layer.

An organic light-emitting device comprising:

• a first electrode;
• a second electrode;
• organic multi-layers;
• a charge generation layer;
• the organic multi-layers and the charge generation layer being stacked alternately between the first electrode and the second electrode;
• the first electrode and the second electrode being in contact with the organic multi-layers;
• the organic multi-layers having at least a hole blocking layer, an emission layer, and an electron blocking layer;
• and
• the emission layer being stacked in plurality and interposed between the hole blocking layer and the electron blocking layer;
• wherein a light-emitting dopant is added to the hole blocking layer, the emission layer, and the electron blocking layer, and the light-emitting dopant traps carriers that inject to the emission layer.